How to play: Arrange students in groups of three and each gets one answer document and one card. Students work on the problems and add up all their answers for a grand total, which is the ONLY thing you check.

Why I love this: When students get the total wrong, it makes them check all the questions and all the work. Students communicate their reasoning and practice error analysis skills. It helps them recognize the simple mistakes, but encourages them to teach each other clearly. If the team is stuck, I've provided hints! You also don't have to check three problems; you only check one answer!